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Finding the Fourth Proportional to 87,085, 120,202.95 and 56,874.97

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Solution

The fourth proportional to 87,085, 120,202.95 and 56,874.97 is: 78,504.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,085 : 120,202.95 = 56,874.97 : x
  2. Step 2: Convert to fraction form
    87,085/120,202.95 = 56,874.97/x
  3. Step 3: Cross multiply
    87,085x = 120,202.95 × 56,874.97
  4. Step 4: Simplify right side
    87,085x = 6,836,539,175.16
  5. Step 5: Solve for x
    x = 6,836,539,175.16/87,085
  6. Step 6: Final answer
    x = 78,504.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.